As usual, you're totally misinterpreting the scene and not making any sense. The shield Iron Man puts up doesn't go around Thor or anyone else. The shield goes around the bottom of Sokovia so that when Thor hits the vibranium, the shock waves will reverberate down to the shield and then back up in order to completely destroy the city. Thor's power causing the vibrations through the vibranium destroys a whole city. And there's precedent for this because in the first Thor movie, Thor destroys a huge swath of Jotunheim with one strike. Nothing Superman has done in the movies has shown that kind of power. Being in the center of an explosion that destroyed an entire city, an explosion caused by Thor, merely stunned him. A similar explosion all but left Superman for dead.

This is exactly what Friday said.

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FRIDAY: The anti-gravs are rigged to flip.Touch them, they'll go full reverse thrust.
The city's not coming down slow.
STark : Spire is vibranium.If I get Thor to hit it...
FRIDAY : It will crack. That's not enough.The impact would still be devastating.
STARK: Maybe if we can cap the other end. Keep the atomic action doubling back.
FRIDAY: That could vaporise the city & everyone on it..
STARK : I got it. Create a heat seal.I could...I could supercharge the spire from below.
FRIDAY Running numbers
FRIDAY : A heat seal could work with enough power.
STARK: Thor, I got a plan.
THOR : We're out of time.

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The heat seal was to contain the blast so everyone including Thor don't get vaporised with the city.

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Nope. You're totally wrong. Let's go through this nice and slow for you so you understand since you struggle with language...

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FRIDAY: The anti-gravs are rigged to flip. Touch them, they'll go full reverse thrust. The city's not coming down slow.
Stark : Spire is vibranium. If I get Thor to hit it...
FRIDAY : It will crack. That's not enough. The impact would still be devastating.

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Ultron has raised Sokovia into the sky in order for the anti-gravs to flip and go into full reverse thrust, sending the city back to Earth to destroy all human life. If Stark gets Thor to hit the spire, the CITY will crack but that's not enough because huge chunks will still rain down on Earth and still cause devastation.

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STARK: Maybe if we can cap the other end. Keep the atomic action doubling back.
FRIDAY: That could vaporize the city & everyone on it..

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If Stark blocks the power of Thor's strike on the other end (the bottom of the city because Thor is at the top), then the power from the strike will double back upward and vaporize the city. Before, Thor's strike would have just cracked the city and the power from the strike would dissipate outward after that. Stark creates a cap that reverberates that power back up, preventing that dispersion.

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STARK : I got it. Create a heat seal. I could...I could supercharge the spire from below.
FRIDAY Running numbers
FRIDAY : A heat seal could work with enough power.
STARK: Thor, I got a plan.

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The heat seal IS the cap Stark creates to double the power back up and vaporize the city. It is not to protect people, which is precisely why the Avengers and SHIELD evacuated everyone first!

So Friday says that the explosion would vaporize the city and everyone and then Stark says "OK, let's kill everyone" and creates a seal to do that?

Are you sure you gave watched the movie? Because the heat seal was to secure everyone including Thor. That's what the dialog says straight up.

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Thor hit the vibranium, the vibrations from the vibranium went downward, hit Stark's heat shield and reverberated back up, and vaporized the city. But it was all Thor channeling the power to destroy the city.

Never mind the dialog which says that if Thor hits the spire if will not do anything more than crack the spire.

Who cares about what's actually said. Let's make some stuff about Thor.